Amsterdam police said they are “aware of reports of a possible hostage situation” after a violent attack on Israelis following a soccer match on Thursday night.

Fans of the sport gathered at the city’s Johan Cruyff Arena to watch the game between Amsterdam’s Ajax and Israel’s Maccabi Tel Aviv. In a news release, the City of Amsterdam said that Maccabi supporters were attacked in several locations and the “police had to intervene” in order to “protect Israeli supporters and escort them to hotels.”